The ole' plumbing adage (by adding a few letters to the beginning of the title) is most certainly true and I'd like to touch on just how to help move it "down that hill". Nothing like reading about sewage flow, no? Or you can just skip the reading, look at the pictures, leave a comment, and move on with your day :)
The per-foot drop rate for wastewater and drainage pipes ideally is 1/4". In other words, the ideal number ratio to keep things movin' along properly. And if the drain doesn't have enough slope, obviously the waste isn't going to flow properly. On the other hand, if there is too much or excessive slope, as shown in the picture (the green pipe), solids and liquids could start separating (a thumbs down installation).
This installation may lead to "mounding" or collecting of solid waste, that couldeventually lead to blockages and/or impeded drainage. Something you, obviously, never want to happen. There is a point to mention on this though. If that excessive slope is 45°-to-vertical, well, gravity definitely will be a factor, and things will almost certainly drain one way or the other (in other words, a thumbs up installation).
So to sum it all up, drain pipes should slope 1/4" to 1/2" per foot and/or be vertical. Or just have a good plumber install/repair your plumbing the right way and then you won't have to worry about having a plumber on speed dial to keep coming over to clean your pipes out.
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